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Current
• A measure of the flow of charge.
• Ampere: Electrical measurement of the flow of electrons.
• 1 Ampere = 1 Coulomb/second.
• 1 Coulomb = 6,250,000,000,000,000,000 Electrons
Conventional Current
• Conventional current = positive charge flow.
• Electron Flow is in opposite direction
Voltage
• The force that pushes electrons through a wire.
• Electrical Pressure or “Potential Difference”.
• Measured in Volts• 1 volt = 1
joule/Coulomb
Voltage
• Water analogy: Voltage is the water pressure supplied by the pump (battery) or a water tower.
• The symbol for voltage = V
Resistance
• A resistor hinders the flow of current through a circuit.
• Ohm = unit of resistance (Ω)
Resistance
• Water analogy: a waterwheel, constriction in pipe, or other object that hinders flow.
• Symbol is R